A separator for separating raw milk into a skimmed milk phase, a cream phase and an ejection phase that comprises solid impurities is disclosed. The separator includes an ejection port arranged at a periphery of the separator to eject the ejection phase. A cyclone is connected to the ejection port to receive and decelerate the ejection phase, and a vessel in fluid communication with an ejection phase outlet of the cyclone to receive and collect the ejection phase from the cyclone. The cyclone includes a port that is open to the atmosphere, such that pressure build-up created in the cyclone when the ejection phase is ejected from the separator into the cyclone is released.